38 relations: Angular diameter, Apparent magnitude, Barred spiral galaxy, Blue giant, Blue supergiant star, Declination, Dorado, Emission nebula, European Southern Observatory, Extinction (astronomy), H II region, H-alpha, Karl Gordon Henize, La Silla Observatory, Lamont–Hussey Observatory, Large Magellanic Cloud, LH41-1042, Light-year, LMC195-1, Luminous blue variable, Milky Way, Minute and second of arc, MPG/ESO telescope, NGC 1910, Open cluster, Parsec, R85, Right ascension, S, S Doradus, Small Magellanic Cloud, Spectral line, Spiral galaxy, Stellar wind, Superluminous supernova, Supernova, Supernova remnant, Wolf–Rayet nebula.
The angular diameter, angular size, apparent diameter, or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars.
In astronomy, a blue giant is a hot star with a luminosity class of III (giant) or II (bright giant).
Blue supergiant stars are hot luminous stars, referred to scientifically as OB supergiants.
Christmas is an annual festival commemorating the birth of Jesus Christ,Martindale, Cyril Charles.
The Christmas season, also called the festive season, or the holiday season (mainly in the U.S. and Canada; often simply called the holidays),, is an annually recurring period recognized in many Western and Western-influenced countries that is generally considered to run from late November to early January.
Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus.
Christmas traditions vary from country to country.
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.
Dorado (English pronunciation) is a constellation in the southern sky.
An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths.
The European Southern Observatory (ESO) is a 15-nation intergovernmental research organization for ground-based astronomy.
In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.
An H II region or HII region is a region of interstellar atomic hydrogen that is ionized.
H-alpha (Hα) is a specific deep-red visible spectral line in the Balmer series with a wavelength of 656.28 nm in air; it occurs when a hydrogen electron falls from its third to second lowest energy level.
Karl Gordon Henize, Ph.D. (2004 News Releases, NASA Jet Propulsion Laboratory, Pasadena, California (US), March 8, 2004 17 October 1926 – 5 October 1993) was an American astronomer, space scientist, NASA astronaut, and professor at Northwestern University.
La Silla Observatory is an astronomical observatory in Chile with three telescopes built and operated by the European Southern Observatory (ESO).
The Lamont–Hussey Observatory (LHO) was an astronomical observatory owned and operated by the University of Michigan (UM).
The Large Magellanic Cloud (LMC) is a satellite galaxy of the Milky Way.
LH41-1042 is a Wolf-Rayet star located in the Large Magellanic Cloud (LMC).
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
LMC195-1 is a Wolf-Rayet star located in the Large Magellanic Cloud (LMC).
Luminous blue variables (LBVs) are massive evolved stars that show unpredictable and sometimes dramatic variations in both their spectra and brightness.
The Milky Way is the galaxy that contains our Solar System.
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
The MPG/ESO telescope is a 2.2-metre f/8.0 (17.6-metre) ground-based telescope at the European Southern Observatory (ESO) in La Silla, Chile.
NGC 1910, or LH-41, is an OB association in the Large Magellanic Cloud.
New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.
New Year's Day, also called simply New Year's or New Year, is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar.
In the Gregorian calendar, New Year's Eve (also known as Old Year's Day or Saint Sylvester's Day in many countries), the last day of the year, is on 31 December which is the seventh day of Christmastide.
An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.
The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.
R85 (or RMC 85, after the Radcliffe Observatory Magellanic Clouds catalog) is a luminous blue variable located in the LH-41 OB association in the Large Magellanic Cloud.
Right ascension (abbreviated RA; symbol) is the angular distance measured only eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point above the earth in question.
S (named ess, plural esses) is the 19th letter in the Modern English alphabet and the ISO basic Latin alphabet.
S Doradus (also known as S Dor) is located 160,000 light years away, and is one of the brightest stars in the Large Magellanic Cloud (LMC), a satellite of the Milky Way.
The Small Magellanic Cloud (SMC), or Nubecula Minor, is a dwarf galaxy near the Milky Way.
A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae(pp. 124–151) and, as such, form part of the Hubble sequence.
A stellar wind is a flow of gas ejected from the upper atmosphere of a star.
A superluminous supernova (SLSN, plural superluminous supernovae or SLSNe; also known as hypernova) is a type of stellar explosion with a luminosity 10 or more times higher than that of standard supernovae.
A supernova (plural: supernovae or supernovas, abbreviations: SN and SNe) is a transient astronomical event that occurs during the last stellar evolutionary stages of a star's life, either a massive star or a white dwarf, whose destruction is marked by one final, titanic explosion.
A supernova remnant (SNR) is the structure resulting from the explosion of a star in a supernova.
A Wolf–Rayet nebula is a nebula which surrounds a Wolf–Rayet star.
2018 has been designated as the third International Year of the Reef by the International Coral Reef Initiative.
2019 (MMXIX) will be a common year starting on Tuesday of the Gregorian calendar, the 2019th year of the Common Era (CE) and Anno Domini (AD) designations, the 19th year of the 3rd millennium, the 19th year of the 21st century, and the 10th and last year of the 2010s decade.